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@uitrit i tats atnt @fitta NORMAN B. CRAWFORD, OF BENNINGTON, VERMONT.

Letters Pa-tent No. 71,139, dated November 19, 1867.

IMPROVEMENT IN BUILDING-SONET OLD.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, NORMAN B. CRAWFORD, of Bennington, in the State of Vermont, have invented and made a certain new and useful Improvement in Scaifolds for Buildings; and I do hereby declare the following 'tobe a full, clear, and exact description of thc saidinvention, reference being had to the annexed drawing making part of this specification, wherein- Figure 1 is an elevation of the said scaffold, and.

Figure 2 is a side view of the same. (In both'iigures the poles are shown as shortened by the removal of the centre part.)

Figure 3 is a side view, and

Figure 4 is an inverted plan of the platform.

Similar marks of reference denote the same parts.

Theobject of my invention is to furnish a movable scatlold, that canbe employed at the side of a building, and suspend, at any desired point, a platform-for the workmen.` vmake use of poles that may be lengthened by the addition of sections, sustaining arms resting against the .building to support the upper ends of the poles, winch-barrels and ropes for elevating or lowering a platform that is vformed of sections hooked together.v

In the drawing, a represents the earth or other support for the scaffolding, and the building or part thereof against which the scaifold is placed. c c are the scalfold-poles, formed of sectionsof the desired'length, made with diagonal ends that pass into and wedge against each other within the metallic sleeve-s Z d, that foiconvenience should be attached to one of the ends of the poles, the other contiguous end sliding freely into such sleeve. The upper ends of the poles are provided with arms, e, with crossfp'ieces at theirextremities, that rest against or are attached to the building. In the case of wooden structures I prefer to have the ends ofthe arms lbolted to the timbers or to the planking. I employ upon each of the poles a winch-barrel,f, supported in a frame, and fitted with cranks by which it may be rotated; 'and a'pin, 3, introduced in a hole in the frame, is employed to keep the winch from turning after it has been turned to draw in or let out the rope t' to the desired point. This rope z' passes from the winch up over the sheave z, down belowthe sheaves c and Z, on the frame m of the platform n., and thence up to the eye 2 on the arm e. The frame m is made with a .bar,.o, extending out at the side of the pole c, and a pin, 4, can be inserted to steady the same. The platform n, that rests upon the frames vn, is formedof sections, as seen irr gs. 3 and 4, the side pieces 5 5 being united by cross-pieces t Z1 below, and the ends having strap-hooks, 7, and eyes, S, that allow the sections to be hooked together or unhooked, and the depth of the side pieces 5 is such as to insure the necessary strength according to'the length of the platform. The boards n, introduced upon thecross-picces 6, and between the frames 5,v furnish the supporting surface for the workmen in constructing the building, and this platform can be raised-cr lowered to any desired point. The ladderp is formed of poles, tted to be extended by sections, thesame as the scali'old-poles. AThe ropes or chains t' may pass through double blocks, 'so as to increase the purchase of the winch in raising or lowering the platform orstaging, and braces may be employed between the poles and arms.

What I claim, and desire to secure by Letters Patent, is l v The scaffolthpoles c, tted toibe extended in length as set forth,in combination'with the winch-barrels f, frames m, and platform it, as and for the purposes specified.

I also claim the platform n, formed of sections hooked together in the manner set forth.

In witness whereof I havehereunto set my signature, this twentieth day of September, A. 13.1867.

i NORMAN B. CRAWFORD.

Witnesses t JAS, A. W. WILLIAMS, JAnEs B. MEAcnAM. 

